Molding apparatus.



`fzefrs es E'. KRGB. Y HOLDING 'PARATUS. APPLIoATIoN FILED AUG. 9,19os

Patented Den 8, 190s.

reins or No. 906,240. 'Original application tiled August 5, 1963, Serial To all whom it 'may concern: Beit known that I, FRANK Knnenn, a citi zen oi? the United Stetes, and resident of Cleveland, county of Cuyahoga, lState" of Ohio, have invented certain new end useful improvements in Molding Apperstus, of which l hereby declare the following to be a full, clear7 and exact description., such as will enable others skilled in the artto which it, appertains to make andvuse the same.

The invention has for its objects to provide i en automatic device to ive a quick vibrer tory movement to the rnd in the foundry in order' to facilitate lifting the# cope or up er portion of the mold from the atterri, an to confine the vibration to the rag end lower ortion'oi the mold after the cope begins to lift, thus jarring loose the pattern from the mold in the dreg and preventing itfrom clingingy to end tearing or breaking up the surface of the mold as the pattern is withdrewn therefrom.

l arri awarethet heretofore e.- vibratory delvice hes `been employed, attached to e, tour sided freine with e :metal bottom to which the pattern is secured. ln that device the pattern is vibra-ted by direct contact with the metal surface. rIliis invention however, is of a different character designed to provide ini-- proved and more el'licient results owing to the finertiaA of the metal pattern inclosed Within the body of Sandi coni rising the mold and the natural settling end gardening of the send about `the pattern thus produced, which has a lesstendency to shake loose end to destroy the perfect surface of the mold, than if there were any direct connection between the pattern and wall or bottoni of the mold.

l accomplish these objects by rneans of the hereinafter described apparatus, which is eXu empliiied in the accompanying drawings and spcciicelly pointed ont in the claims.

ln the leccornpanying drawings, Figure i I a transverse section of o inolders bench sborring c cope and drm thereon, and e vibretory deyice secured to the bench, whereby the vibration imparted thereby will be communicated to the pattern, embedded in the sand of l the mold. Fig. 2 is an end elevation of cope and drag, showing the vibratory device etteched directly to the drag, and a portion of the ligure is sectioned to show more clearly the pattern which is embedded in the sand of the mold. 3 a longitudinal section of 55 a Vibrating or vibration causing device such. l

Spicication oi Letters Patent.

Petentcd Dec.. 8, 1908.

August 9, 1905.

No. 168,313. Divided and this applicntcn Serial No. 273,25

.as may be employed to obtenu the. desired eiect, .and such as is more fully described in my application for Lettersfletent led August 5, 1903, bearing Ser.- Nc. ll, ot which epplicstion this application is a division;

In theseviews '1,'isthe molders bench, 2 the drag, 3 the cope, i the send filling the mold box. It will be seen that the pattern 5 is embedded in the sand without any attachment whateverto the sides or bottom of the drag and that any `vilnetion cornrnuniceted to it must be through the sand. -On account of the weight of the pattern however, and its inherent inertie it will remain comparatively quiet in the mass about it and enyinov ement will merely'tend to settle it in the sand end.

compact the sandrnore completely about it,

s o es to loosen it but not discrrange the incid' surface.

. 6 is the vibrator which ni Fig. b is shoe-m to comprise,` en inclosed pneuinetic chamber at one end ci the vibrator s forf vattaching the vibrator to drag. And pin il. at the oth-e., vibretor is ,struclr by bend to more 'weighted plunger 'when `storting tlie device' into motion. Above the cylinder ere shown separate chambers l0 and li :tor compression., and releitse, end the plonger is provided with circuleting passegee-12 and i3 which connect these chambers alternately with the inlet passege i4, or ontlet pessege i5, es tber plunger reciprocates in the cylinder strikingits heads'alternately. Y, The operation of the device may be described as `follows. Supposing the'plungerto be located in th left extremity of the cyllnder, and the an fr ressure to be turned on the chamber et therleit or the cy 'lien :is o en to admission end becomes instantlyi led with air under nesrly es compres- 'sion as it wes when it entered the plunger. The compressed air in this chamber serves to move the plunger to the richt by pressure on the left end thereof, since t ere is no pressure upon theright ends-S the right chamber is o en to the discharge at the lei't outlet and t rough one of the circulating passages connecting therewith. As soon :1s the plunger moves sufficiently to cut oil tho inlet (only the width of the passage), the pressure in 'roo chamber at the right is closed as soon as the'l plunger has moved to the right the Width of the passage and has compressed the air ahead. of the plunger during the remainder of its travel which makes a slight resistance.

.It is obvious that one of the outlet passages can be dispensed withsince one will ser'` e the purpose. 'lhe end of the plunger will unicoifer it to discharge the chamber at one end of the stroke and the groove in the lunger will register with-it at-the other encfof the stroke and `discharge the other chamber. The utility of the large chamber at each end of the cylinder is therefore apparent since without a greater volume of air than that in the cylinder the compression at the termina- .tion of the plunger stroke would be so great that the plunger would stop before reaching the end of its stroke in the cylinder. As the plunger completes its stroke to the right and strikes the right cylinder head the circulating passage at the left of the center of the plunger will register with the admission passage in the plunger and will supply compressed air at once to the chamber at the right extremity of the cylinder, while the chamber at the left is discharged, thus vremoving Aall excessive pressure from the left end of the iplunger that was in store for moving it to the right. The pressure within the chamber at the right of the plunger then will drive'the lunger to the let, finally opening the disc arge through the lower passage as at the point of starting. This automatic action Wili icontinue and be repeated indeiinitely as long as the pressure continues. Should the plunger stop at its central position so that neither of the passages in the plunger' will register with the admission passage when the passage is out off, it can be started again when the pressure is turned on by moving the plunger by hand until the starting position is regained.

It is apparent that theehambers at the right and left extremities of the cylinder are a very essential feature of the device, since they contain a comparatively large volume of air and While one 1s illed with compressed air and delivers it under pressure to the plunger to drive it during the central part of its stroke the other receives the air from ahead of the plunger and from its large capacity .absorbs the pressure thereof from the cylinder so that it will not be of sutlicient density .to stop the movement of the plunger.

Having described my invention 'what l claim as new and desire to secure by Let-ters Patent is: i

l. 'lhe combination with a molding flask comprising a drag and a cope, of a pattern therein, and a vibrating device secured to the ydrag whereby the drag is given a vibra tory motion at the time of removing the cope, substantially as and in the manner set forth. 2. 'lhe combination with a molding [lash comprising a dra and cope, of a pattern therein, not engaglng with any portion of the surface of said ask, both cope and drag of the flask being filled with sand in which the pattern is embedded and a vibrating device secured to the drag whereby the drag is given a vibratory motion at the time of the removing of the cope to free by means of inertia the pattern from the sand in both cope and drag. In testimony whereof I hereunto set m hand this 31st day of July 1905.

FRANK KREGER.

Witnesses:

`WM. M. MONROE,

(LH. OLDs. 

